1. not true to duty or obligation or promises;

   "an unfaithful lover"
   

2. having sexual relations with someone other than your husband or wife, or your boyfriend or girlfriend;

   "her husband was unfaithful"
   

3. having the character of, or characteristic of, a traitor;

   "the faithless Benedict Arnold"
   "a lying traitorous insurrectionist"
   

4. not trustworthy;

   "an unfaithful reproduction"
   

1.不忠的；通奸的
If someone isunfaithful to their lover or to the person they are married to, they have a sexual relationship with someone else.

e.g. James had beenunfaithful to Christine for the entire four years they'd been together.
在和克里斯蒂娜共同生活的4年中，詹姆斯一直对她不忠。
e.g. ...herunfaithful husband.
她出轨的丈夫

1. 年<<不忠>：改编自著名小说家尼古拉斯.斯帕克斯(Nicolas Sparks)同名小说的<>,请来2位资深影星理查.基尔及戴安.莱恩饰演情侣;说来理查与戴安早于84年已曾合作<>(The Cotton Club),其后再在02年<>(unfaithful)内饰演婚姻破裂的夫

2.

2. 不忠诱罪：二年的<>(unfaithful),李察基尔饰演被妻子背叛的丈夫,最后揭发妻子的奸情,他一怒之下将奸夫杀掉. 这个角色的个性比<>更加阴沉,而且有点像性格分裂的双面人:平时是好好先生,发怒时却变成杀人凶手.

• With quiet eyes unfaithful to the truth.

  出自：Tennyson

• She's recently split up with him for the second time because he was unfaithful.

  出自：Best